80.高温脱H_2Sにより生じた硫化カルシウムの酸化分解

概要

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Lime is a kind of very important material used as a high-temperature DeH_2S sorbent. However, CaS, product of the process, has to be converted to CaSO_4 before disposal, because H_2S is released from the reaction between CaS and H_2O. In order to elucidate the character of oxidative decomposition of CaS formed from the lime at high-temperature DeH_2S, the effects of the presence of H_2O on the oxidative decomposition were studied using CaS obtained as a reagent. Furthermore, the effects of the pore size distribution of the lime on the oxidative decomposition of the formed CaS were investigated using some macroporous limes prepared by swelling methods that had been developed by our group. The oxidative decomposition of the pure CaS was considerably accelerated by the presence of H_2O under 900℃. This result was explained by the following consecutive two reactions: CaS+3H_2O→CaO+3H_2+SO_2; 2H_2+O_2→2H_2O. The pore size distribution of lime largely affected to the oxidative decomposition degree of the CaS formed from the lime. The macroporous lime prepared by swelling method with acetic acid vapor was highly reactive for DeH_2S, and the formed CaS formed from the macro porous lime was easily converted to CaSO_4 and CaO, although a small amount of CaS still remained after the decomposition.
一般社団法人日本エネルギー学会の論文
2001-11-13